Land for sale in Adams County recently totaled approximately $47 million and almost 2,000 acres. Adams County ranks 82nd in the Hawkeye State for the combined amount of land currently advertised for sale. Of all farms, ranches, hunting land and other land for sale in Adams County, Corning featured the most land for sale. From an economic perspective, manufacturing and related services are the main sectors in Adams County. Adams County is the 92nd largest county (425 square miles) in Iowa. It's located in the Western Iowa region of the state.